Search found 58 matches

by stewrobb
Mar 26 2012 4:12am
Forum: Battery Technology
Topic: What battery chem did they sell me?
Replies: 10
Views: 766

Re: What battery chem did they sell me?

Whats the final voltage on the charge, and how many cells in series, that will definitely help, may not be definite depending on voltage though.
by stewrobb
Mar 26 2012 3:56am
Forum: E-Bike General Discussion
Topic: Thanks ES for helping me with my first build...Pic album
Replies: 7
Views: 2110

Re: Thanks ES for helping me with my first build...Pic album

I lathered the perimeter of the arms with JB-Weld, but still wasn't satisfied with it. After racking my brain for a short while, I checked this thread. Thanks for responding Dogman, big help. I can't believe I didn't think of that, the bolts that is. I took your advice, and drilled two holes on each...
by stewrobb
Mar 23 2012 8:27pm
Forum: E-Bike General Discussion
Topic: Thanks ES for helping me with my first build...Pic album
Replies: 7
Views: 2110

Re: Thanks ES for helping me with my first build...Pic album

Schwinn Network 7 Men's Hybrid Bike (700C Wheels) Doctorbass torque arms ( I used JBWeld, so far so good! Its about $3 and has a Tensile Strength of 3960, Not as good as DP420 with a Tensile Strength of 4500 but its cheep and easy to find. One the arms broke from its weld early on but I don't think...
by stewrobb
Feb 22 2012 10:56am
Forum: E-Bike General Discussion
Topic: Upgrade time! 40mph max speed target. Help
Replies: 54
Views: 3687

Re: Upgrade time! 40mph max speed target. Help

yea im using 12fets. 18fets maybe better but if you do use 18fets, your battery will get drained so much faster... as far as i know, I never need to go faster than 40mph for such a long period of time since there are on road around me where I can go so fast without risking danger If you want to go ...
by stewrobb
Feb 20 2012 8:16pm
Forum: E-Bike General Discussion
Topic: Problems with 12V going into 4S A123 Pack?
Replies: 10
Views: 471

Re: Problems with 12V going into 4S A123 Pack?

Without understanding how the wiring is done, it is impossible to help you diagnose the problem. Good luck in your testing, if you still can't figure it out, draw a simple diagram and post it. For testing, with the main pack removed or unplugged, throw a multimeter between the battery and DC-DC, see...
by stewrobb
Feb 20 2012 2:25pm
Forum: E-Bike General Discussion
Topic: Problems with 12V going into 4S A123 Pack?
Replies: 10
Views: 471

Re: Problems with 12V going into 4S A123 Pack?

That's curious, hard to tell without a wiring diagram or at least a decent description. What voltage is it showing on the CA? Where are the power leads? How is your DC-DC converter wired to the pack, and how is your controller wired, Do you use and ignition wire for one or both? Btw, I don't like th...
by stewrobb
Feb 18 2012 3:32pm
Forum: E-Bike General Discussion
Topic: Problems with 12V going into 4S A123 Pack?
Replies: 10
Views: 471

Re: Problems with 12V going into 4S A123 Pack?

Not bad, as it is not actually going through the DC-DC converter, simply powering the light which I assume is also connected to the same output. Your power supply should be equipped with a diode to handle reverse current, so that really isn't an issue. Cheers,

Stew
by stewrobb
Jan 30 2012 5:13pm
Forum: E-Bike Technical
Topic: 10KW 2WD Build (1 x broken motor = 5KW 1WD now)
Replies: 11
Views: 794

Re: 10KW 2WD Build

Wow, 450lbs, that's impressive. I would love to go on a cross country trip at some point, I had a trip planned across Canada to BC on my 750 Nighthawk, but insurance wants stupid money after I made steel pudding out of my 450, they want >10K :cry: about 6 times my budget. Been craving it ever since....
by stewrobb
Jan 29 2012 9:48pm
Forum: E-Bike Technical
Topic: 10KW 2WD Build (1 x broken motor = 5KW 1WD now)
Replies: 11
Views: 794

Re: 10KW 2WD Build

I'm actually running 2.3" nobbies on deep V rims (want to post pictures but can't find my bloody USB A camera cord), so it should help a bit, but I'm totally with you on the scooter tires, besides, the nobbies will be death on pavement, but they came with the bike. I've actually ordered 2 x 17x2.5 m...
by stewrobb
Jan 28 2012 5:32pm
Forum: E-Bike Technical
Topic: 10KW 2WD Build (1 x broken motor = 5KW 1WD now)
Replies: 11
Views: 794

Re: 10KW 2WD Build

It's going to be purely for street. I live in Toronto, and have really awful paved roads, but I know them well and have gotten good at avoiding them. Sounds like FWD slips very easily, more than I would have thought, especially in a bicycle size wheel. O well, I guess I will have to get it together ...
by stewrobb
Jan 28 2012 3:39pm
Forum: E-Bike Technical
Topic: 10KW 2WD Build (1 x broken motor = 5KW 1WD now)
Replies: 11
Views: 794

Re: 10KW 2WD Build

Lol ya, I went a bit overboard with 2 x 18 FETs. They come stock 60A, but I am thinking about shaving off some shunt for the front, especially if your telling me it gets bad at 3500w for you, probably dial it down to 40A or so. I'm used to running 16 inch scooter tires and rear hubs, so don't have a...
by stewrobb
Jan 28 2012 1:41pm
Forum: E-Bike Technical
Topic: 10KW 2WD Build (1 x broken motor = 5KW 1WD now)
Replies: 11
Views: 794

10KW 2WD Build (1 x broken motor = 5KW 1WD now)

10KW 2WD Winter build Just uploaded pictures from my phone, so not the best quality, but they shall do for now. https://lh4.googleusercontent.com/-Bu1pbqYXDr8/TycfBKPodgI/AAAAAAAAAOs/twEDWmQwwfQ/s640/IMAG0017.jpg https://lh3.googleusercontent.com/-h6Fi-vVSm0M/Tyce8mCNqaI/AAAAAAAAAOU/JiGgf84PTBc/s640...
by stewrobb
Jan 26 2012 5:26pm
Forum: E-Bike General Discussion
Topic: Headway Batteries
Replies: 5
Views: 637

Re: Headway Batteries

Ya, it seems that lifepo4 have a larger tendancy to get unbalanced than lipo, I run lipo without a bms, like just about everybody on here, but lifepo4 is another story. I just ordered 40 x 15Ah cells and they all have very different capacities, ranging from high 16's to high 18's at 0.3c discharge(o...
by stewrobb
Jan 23 2012 12:18pm
Forum: Motor Technology
Topic: Crystalyte HT pimping Episode1
Replies: 6
Views: 1724

Re: Crystalyte HT pimping Episode1

Wow, very impressive. I am curious as to what bearing you used there. It is perfect for my application as well. I plan on getting a spacer fabricated to fit over the existing axle, drill it and put a bearing like the one you are using on the outside, that way I can run delta/wye with some decent wir...
by stewrobb
Jan 20 2012 11:17am
Forum: Motor Technology
Topic: Motor Axle - 2 sided wiring for Delta Wye 10Awg
Replies: 2
Views: 443

Re: Motor Axle - 2 sided wiring for Delta Wye 10Awg

O wow, I really like that idea, seems much more structurally sound, thanks. Now that you mention it I found that stock in a Greenwit motor (Motorino motor). Guess it's time to buy a caliper for the measurements, I figure finding a tube with those exact inside and outside dimensions would be quite di...
by stewrobb
Jan 19 2012 7:53pm
Forum: Motor Technology
Topic: Motor Axle - 2 sided wiring for Delta Wye 10Awg
Replies: 2
Views: 443

Motor Axle - 2 sided wiring for Delta Wye 10Awg

Hey there, I'm starting on my winter project here in the next couple weeks, have the parts arriving on monday actually. I'm doing a high power build and would like to incorporate Delta/Wye switching (have it in my scooter now). The problem is that I also want to use 10awg phase wires, (6 of them for...
by stewrobb
Jan 11 2012 5:31pm
Forum: Battery Technology
Topic: 1 kWh LiPo club, who's in?
Replies: 86
Views: 6919

Re: 1 kWh LiPo club, who's in?

Gio 500+ Shitbucket - 20s3p Turnigy 4s Hardcase 5Ah Packs (x15) - 1.11KWh
by stewrobb
Jan 04 2012 3:22pm
Forum: E-Bike Technical
Topic: X1, X2 - HELP I'm so confused!
Replies: 2
Views: 296

Re: X1, X2 - I'm so confused!

From my experience, 3 speed switches can work one of two ways (dependant on controller obviously): 1. - 3 wires from controller (two signal, one ground) NC = Mid speed X1-GND = Low speed X2-GND = High speed 2. - 2 wires from the controller (one signal, one ground) Connecting the two together changes...
by stewrobb
Dec 11 2011 10:53am
Forum: E-Bike Technical
Topic: Hall Sensor Specifications That Matter
Replies: 6
Views: 558

Re: Hall Sensor Specifications That Matter

Good stuff thanks for the help guys. I'm going to go ahead and order these 480-1999's. I'm not worried about them not being turned on, I am worried it will retard the timing. My concern was that if the trip is higher than the release, it would shift the timing back slightly and change performance. i...
by stewrobb
Dec 10 2011 3:11pm
Forum: E-Bike Technical
Topic: Hall Sensor Specifications That Matter
Replies: 6
Views: 558

Re: Hall Sensor Specifications That Matter

Does anybody know? I think this would be useful for a lot of people, myself included. Thanks
by stewrobb
Dec 10 2011 3:08pm
Forum: E-Bike Non-hub Motor Drives
Topic: ultramotor europa
Replies: 3
Views: 611

Re: ultramotor europa

Glad to hear it was that simple, sometimes I spend hours looking for something more complicated and then I realize it was something stupid, so I try and start from the beginning each time. For something that small you can use a board header and cut both female and male side down to 5 pins, solder th...
by stewrobb
Dec 07 2011 6:12pm
Forum: General Discussion
Topic: Volt crash test fires?
Replies: 11
Views: 686

Re: Volt crash test fires?

Ahhh, fair enough, makes sense. That's pretty sweet actually, not the best for a consumer vehicle I guess (especially in the hands of Toronto drivers :D ), definitely hard to engineer that to a highly safe standard. Guess I can't bash their engineering on that one. Better placement is probably key, ...
by stewrobb
Dec 07 2011 5:14pm
Forum: E-Bike Technical
Topic: Hall Sensor Specifications That Matter
Replies: 6
Views: 558

Hall Sensor Specifications That Matter

Hey there, I've got to replace some Hall sensors, and would like to know what actually makes a difference specification wise. I *thought* these motors needed units with 110g hold -110g release, but looking at Doc's instructable, it seems that he is using 150g hold, 140g release SS41 series units (48...
by stewrobb
Dec 07 2011 4:47pm
Forum: General Discussion
Topic: Volt crash test fires?
Replies: 11
Views: 686

Re: Volt crash test fires?

Lol, now that's ironic, coolant causing a fire. No fuses? Or did the engineers actually decide to put a reservoir right next to battery packs? Are they not properly waterproofed? WTF, screams newb to me. That's worse than one of us keeping a big bottle of water in the same pack as our Lipo's, kind o...
by stewrobb
Dec 07 2011 4:39pm
Forum: E-Bike Non-hub Motor Drives
Topic: ultramotor europa
Replies: 3
Views: 611

Re: ultramotor europa

Sounds like A) controller issue, or B) hall sensor issue. Repairs on these motors is barely worth it if you can't do it yourself, shipping is brutal on these things, (it is a pain to do as well mind you). Most people here are willing to help diagnose a problem, but we would need more details. No use...